1SDA055977R1 ABB E2S1250 1250 A 4-Pole Withdrawable Air Circuit Breaker

Why Choose the ABB E2S1250 1SDA055977R1 Air Circuit Breaker?

The ABB E2S1250 1SDA055977R1 is a high-performance SACE Emax air circuit breaker (ACB) moving part designed for protection and switching in high-current low-voltage electrical distribution systems. Part of the proven ABB SACE Emax E2 series, this four-pole withdrawable breaker combines a 1250 A rated current with the electronic PR121/P-LSI trip unit for dependable overload, short-time and instantaneous short-circuit protection.

Designed for demanding industrial and commercial power distribution applications, the E2S1250 provides reliable circuit protection while its withdrawable construction supports convenient inspection, replacement and maintenance when installed with the appropriate Emax fixed part. The PR121/P-LSI electronic release provides L, S and I protection functions, allowing coordinated protection against sustained overloads and short-circuit conditions.

This model is a four-pole withdrawable moving part rated at 1250 A and for operational voltages up to 690 V AC. The E2S performance level provides a rated ultimate short-circuit breaking capacity of 85 kA at 415 V AC, making it suitable for substantial distribution systems where high fault-current interruption capability is required.

Key Advantages

• High-current 1250 A air circuit breaker moving part for low-voltage power distribution.
• PR121/P-LSI electronic trip unit provides long-time, short-time and instantaneous protection.
• 85 kA breaking capacity at 415 V AC for demanding fault conditions.
• Four-pole withdrawable configuration supports maintainable switchboard installations.
• Rated operational voltage up to 690 V AC.
• High short-time withstand capability supports selective distribution-system protection.

Key Features

• ABB SACE Emax E2S1250 air circuit breaker.
• 1250 A rated current.
• 4-pole configuration.
• PR121/P-LSI electronic release.
• LSI protection functions: long-time, short-time and instantaneous.
• Withdrawable moving part (W MP) execution.
• 85 kA Icu at 415 V AC.
• 65 kA Icu at 690 V AC.
• 65 kA Icw for 1 second.
• Rated insulation voltage of 1000 V.
• Rated impulse withstand voltage of 12 kV.

Reliable Protection for High-Current Distribution Systems

Air circuit breakers such as the ABB E2S1250 provide switching and protection at the main and distribution levels of low-voltage electrical installations. Their high current ratings, substantial short-circuit interruption capability and electronic protection make them particularly suitable for switchboards supplying industrial machinery, infrastructure and large commercial loads.

The PR121/P-LSI electronic trip unit provides long-time overload, short-time delayed short-circuit and instantaneous short-circuit protection. Combined with the withdrawable SACE Emax platform, this configuration delivers dependable electrical protection while allowing the breaker moving part to be withdrawn from its compatible fixed part for servicing and maintenance.

Typical Applications

• Main low-voltage switchboards and distribution boards.
• Industrial power distribution systems.
• Manufacturing and process plants.
• Commercial and infrastructure electrical installations.
• Transformer secondary and feeder protection.
• High-current machinery and production systems.